Get last value in sequence - sql

Question

I am trying to return the last value in a sequence of a particular event, my inital thought was to use LAST_VALUE() but I can't get this to work. I could do this with subqueries and joins however is there a window function that would give this result far easier?
Right now the query is pulling the max amount but what I want is the last amount based on the seq column
SQL Fiddle
Data
| PaymentID | Description | Result | Seq |
|-----------|----------------------|--------|-----|
| 1 | Entered Payment Page | Yes | 1 |
| 1 | Amount Entered | 50 | 2 |
| 1 | Amount Entered | 60 | 3 |
| 1 | Amount Entered | 20 | 4 |
| 1 | Amount Confirmed | Yes | 5 |
| 2 | Entered Payment Page | Yes | 1 |
| 2 | Amount Entered | 100 | 2 |
| 2 | Amount Confirmed | Yes | 3 |
| 3 | Entered Payment Page | Yes | 1 |
| 3 | Amount Entered | 4 | 2 |
| 3 | Amount Confirmed | No | 3 |
| 3 | Amount Entered | 8 | 4 |
| 3 | Amount Confirmed | Yes | 5 |
Current Query Result
| PaymentID | InPayment | Amount | Confirmed |
|-----------|-----------|--------|-----------|
| 1 | Yes | 60 | Yes |
| 2 | Yes | 100 | Yes |
| 3 | Yes | 8 | Yes |
Desired result
| PaymentID | InPayment | Amount | Confirmed |
|-----------|-----------|--------|-----------|
| 1 | Yes | 20 | Yes |
| 2 | Yes | 100 | Yes |
| 3 | Yes | 8 | Yes |

Answer 1

You can use row_number() and conditional aggregation:
select paymentid,
max(case when description = 'Entered Payment Page' then result end) as inpayment,
max(case when description = 'Amount Entered' then result end) as amount_entered,
max(case when description = 'Amount Confirmed' then result end) as amount_confirmed
from (select t.*,
row_number() over (partition by paymentid, description order by seq desc) as seqnum
from paymentinfo t
) t
where seqnum = 1
group by paymentid;
Here is a SQL Fiddle.